Hope I did some 'de-inclarification' here. That's not per se a 'wrong term', just a little misused in the context, since all the tool does is edit 'Shapes' within CityEngine. Since MultiPatches are just a term used in the GIS world and 'MultiPatch' does not actually exist in CityEngine terminology, many people use the term 'MultiPatch Editor' instead of 'Polygonal Shape Creation Tool'. Terminology of Shape Editing Tools ( such as the 'Polygonal Shape Creation Tool' ) : Use F11 and F12 to toggle the visibility of Shapes and Models individually. Shapes are always rendered with little grey wireframe lines, independent of whether the viewport is displayed with wireframes ( toggle by 7 key ) or not. Shapes and Models are rendered (= 'displayed') differently in CityEngine's 3d viewport. Rendering of Shapes and Models in the 3d viewport : So what we learn from this is that there's a very important distinction between exporting Shapes and exporting Models. This basically just copies the incoming geometry of the shape (plus textures, if existing) into the final Model geometry. So how can I just create a Model from a Shape without altering it otherwise ?īy just using a very simple CGA rule with the code : So what happens by default is that if no Model can actually be generated, the Shape is exported instead as if it were the Model. Other options : 'Export generatable models' and 'Export shapes only' Have a look at the ‘Edit 3D geometry and textures’ video in our video gallery. replace the old geometry with the new one in an ArcGIS edit session. use the 3D modeling package of choice (for example SketchUp) and. Have a look in the exporter's General Settings, under 'Exported Content' :ĭefault : 'Export models if generatabla, else export shapes' Basically it comes to: export the object you need to modify from ArcGIS as a COLLADA model. So when a Model, which can successfully be generated, is exported to a gdb, a MultiPatch feature class is written or updated in that gdb.īut what happens at the export, when for one of the above reasons, a Model can not be generated ? If either the rule file contains errors, the start rule is undefined or for other such reasons, a Model can not be generated from the Shape and you'll get a CGA warning during Generation. If a MultiPatch is imported into a CE scene via gdb, Shapes are created.Ī Model can only be generated, if a valid rule file and start rule is assigned. Now in the GIS world, 3d geometries are represented and stored as MultiPatches, so there's no distinction between Shapes or Models. So the so-called 'Static Models' are already the Result and thus have no slots for rule file and start rule in the Inspector. That means that the RESULT of the work in CityEngine is always supposed to be a Model. It is still a little confusing to some people to distinguish between Shapes, Models and MultiPatches, when working with CityEngine.ġ Shape + 1 Rule File -> Generate -> 1 Model
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